The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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7 Day Vegetable Soup Diet and Weight Loss Medication in the UK
The 7 day vegetable soup diet is a popular short-term approach to weight loss, but for sustained results many people combine dietary changes with evidence-based prescription weight management options available in the UK. If you're considering structured eating plans, it's worth understanding what medication and medical support are available alongside lifestyle changes. Whether through NHS weight loss services or private prescription options, eligible adults in the UK can access clinically proven treatments that may support your weight management goals when combined with healthy eating and increased activity.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
UK Prescription Weight Loss Options for Eligible Adults
If you meet eligibility criteria, three prescription-only GLP-1 medications are licensed in the UK for weight management: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These medications work by mimicking natural hormones that regulate appetite and help you feel fuller after eating.
Eligibility: You may be considered if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Adults of South Asian, Chinese, Black African, or Black Caribbean heritage may qualify at lower BMI thresholds (27.5+).
Clinical trials show that alongside dietary changes and increased physical activity, these medications can help participants lose an average of 15–21% of body weight — though individual results vary significantly. Each medication requires a prescription following a clinical assessment with your GP or a licensed prescriber.
Clinically BackedWeight Loss
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private Access — How to Start Your Conversation
In the UK, prescription weight management is available through two routes. NHS access: Referral from your GP to a specialist tier 3 weight management service. Regional availability varies and waiting lists can be lengthy in many areas. Private access: Online consultations with UK-licensed prescribers followed by dispensing through GPhC-registered pharmacies — available without NHS referral.
Before considering any weight loss medication, calculate your BMI using our free BMI calculator to understand your starting point. Then speak with your GP about whether prescription treatment might be appropriate for your health profile. Your GP can discuss eligibility, benefits, potential side effects, and whether combining medication with structured eating plans like vegetable-focused diets aligns with your health goals.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Is a 7 day vegetable soup diet safe on its own?
Short-term restrictive diets can support initial weight loss but sustainable results require long-term lifestyle changes. A diet based primarily on vegetables lacks adequate protein and nutrients for extended periods. Combine any structured eating plan with balanced nutrition and consider professional guidance, especially if you have underlying health conditions.
Can I use prescription weight loss medication with a vegetable soup diet?
Yes. GLP-1 medications like Mounjaro and Wegovy are designed to work alongside dietary changes and increased physical activity. Your prescriber will discuss how medication fits with your eating plan and lifestyle. Never start any new diet or medication without consulting your healthcare provider first.
How do I check if I'm eligible for weight loss medication on the NHS?
Start by calculating your BMI using a free calculator, then speak with your GP. They can assess your health history, weight-related conditions, and whether referral to a specialist weight management service is appropriate. NHS eligibility criteria consider BMI (30+) and presence of weight-related health complications.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections licensed in the UK for weight management. Mounjaro (tirzepatide) is a dual GIP/GLP-1 medication with clinical trial data showing approximately 15–21% average weight loss. Wegovy (semaglutide) is a GLP-1 medication showing approximately 15% average weight loss. Individual results vary; your prescriber can advise which may suit you better.
How quickly will I lose weight on prescription medication?
Weight loss typically becomes noticeable after 4–8 weeks. Clinical trials measured results over 68–72 weeks. Speed depends on your starting weight, dose, adherence, diet, activity level, and individual metabolism. Sustainable loss of 0.5–1 kg per week is recommended by the NHS alongside any treatment.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.